erythema nodosum leprosum

[lĕ-prōsəm]
n.
  1. An acute lepromatous reaction with generalized systemic involvement characterized by the formation of painful deep nodules on the face, thighs, and arms, usually seen in undiagnosed, untreated, or neglected cases of leprosy.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.